package com.catb.web.controller;

import java.awt.image.BufferedImage;
import java.io.IOException;

import javax.imageio.ImageIO;
import javax.servlet.ServletOutputStream;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;

import com.catb.common.Constants;
import com.google.code.kaptcha.Producer;

@Controller
public class CaptchaController {

	private Producer captchaProducer;

	@Autowired
	public void setCaptchaProducer(Producer captchaProducer) {
		this.captchaProducer = captchaProducer;
	}

	@RequestMapping(value = "/captcha-generator", method = RequestMethod.GET)
	public void generateQACaptcha(HttpServletRequest request, HttpServletResponse response) throws Exception {
		setResponseAttributes(response);
		// create the text for the image
		String capText = captchaProducer.createText();
		// store the text in the session
		request.getSession().setAttribute(Constants.QA_CAPTCHA_KEY, capText);
		writeImage(response, capText);
	}
	
	@RequestMapping(value = "/cd-captcha-generator", method = RequestMethod.GET)
	public void generateCriminalDenouncementCaptcha(HttpServletRequest request, HttpServletResponse response) throws Exception {
		setResponseAttributes(response);
		// create the text for the image
		String capText = captchaProducer.createText();
		// store the text in the session
		request.getSession().setAttribute(Constants.CD_CAPTCHA_KEY, capText);
		writeImage(response, capText);
	}
	
	private void setResponseAttributes(HttpServletResponse response) {
		// Set to expire far in the past.
		response.setDateHeader("Expires", 0);
		// Set standard HTTP/1.1 no-cache headers.
		response.setHeader("Cache-Control", "no-store, no-cache, must-revalidate");
		// Set IE extended HTTP/1.1 no-cache headers (use addHeader).
		response.addHeader("Cache-Control", "post-check=0, pre-check=0");
		// Set standard HTTP/1.0 no-cache header.
		response.setHeader("Pragma", "no-cache");
		// return a jpeg
		response.setContentType("image/jpeg");
	}
	
	private void writeImage(HttpServletResponse response, String capText) throws IOException {
		// create the image with the text
		BufferedImage bi = captchaProducer.createImage(capText);
		ServletOutputStream out = response.getOutputStream();

		// write the data out
		ImageIO.write(bi, "jpg", out);
		
		try {
			out.flush();
		} finally {
			out.close();
		}
	}
}
